My mother-in-law has asked me to sell my late father-in-laws port. He sadly passed away 7 years ago, and it has been laying in cool dark storage since long before then. The bottles have now been moved to my house, where they are laying in a wine rack in a cool room.

I have no idea of value, so I am relying on the honesty of people on here.

You have a collection of unusual Ports but unfortunately none that would attract high prices.

The Graham Malvedos 1979 is an older vintage of a brand you would currently see for about £25 for in Tesco or Sainsbury. Being a bit older you might get a few pounds more than that for it, but not a lot more.

The Souza ports are quite unusual to find in the UK but that house is not renowned for making this style of Port. Their main production is Port aged for many years in wood and then bottled when ready to drink. The ones you have are bottle aged Ports, which is not Souza's speciality. The 1970 is the one most likely to spark interest as it was a universally fabulous vintage. If the bottle has been well stored it should be very nice. In a private sale I think you might get £50-£75 for it. 1978 was not a good year and I think you are looking at about half that estimate for that bottle. The 1981s are "Late Bottled Vintage Port", which is not the same as "Vintage Port" and does not command a high price. I think £15-£20 per bottle would be the most you should hope for with those.

The good news is they all look to be in great condition so hopefully soon will be interested in buying them.